Table 12 — Benshaw, Inc. Solid-State Starter Troubleshooting Guide (Continued)

Problem

Probable Causes

Area of Correction

 

 

 

AK board power

AK board not functioning

Replace board.

applied, run command

properly.

 

 

given, starter at full

 

 

 

 

voltage, but aux LED

 

 

 

 

not lit.

 

 

 

 

 

 

 

1L boards LEDs lit.

Motor terminal voltage

Check motor terminal voltages for imbalance between

 

phase imbalance exists.

phases. If an imbalance exists, check for loose SCR gate

 

 

 

or open SCR gate. Replace phase assembly, if necessary.

 

 

 

BC board LED L4 and

BC board not functioning

Replace board.

L5 not lit.

properly.

 

 

 

 

 

 

 

BC board LED L3 lit.

1.

FU5 and FU6 fuses not

1.

Check fuses FU5 and FU6. Replace if necessary.

 

2.

functioning properly.

2.

 

 

Phase assembly not

Verify that bypass is pulling in by measuring the voltage

 

 

functioning properly.

 

drop across the contacts. The reading should be 50 mV

 

3.

Fan not functioning

3.

or less. Replace phase assembly, if necessary.

 

 

properly.

Verify fan operation on each phase for 200 amp units.

 

 

 

 

Replace fan, if necessary.

 

 

 

BC board L2 lit.

SCR phases not function-

Measure resistance from anode to cathode for each SCR

 

ing properly.

phase assembly. Replace shorted phase, if necessary.

 

 

 

BC board L1 lit.

Motor lead grounded.

Megger motor to test for motor lead going to ground.

 

 

 

Start command given.

Motor does not begin rota-

Turn ‘Starting Torque’ potentiometer RV2 clockwise until

 

tion.

motor rotation begins.

 

 

 

Motor does not reach

Ramp up setting is not cor-

Turn ‘Ramp’ potentiometer RV1 counterclockwise. Restart

full speed within 25

rect.

motor and verify that motor reaches full speed within 25

seconds.

 

 

seconds.

 

 

 

 

 

115 vac missing from

1.

CB2 is not on.

1.

Verify CB2 is on.

LL1 and LL2.

2.

Fuse no. 4 (FU4) blown.

2.

Check FU4 for continuity. Replace, if necessary.

 

 

 

 

 

SMM not responding.

1.

CB4 is not on.

1.

Verify CB4 is on.

 

2.

Potentiometer RV1

2.

Adjust potentiometer RV1 for 24 vac at SMM terminals

 

 

needs adjustment.

 

J3-23 and J3-24.

 

 

 

 

 

Legend

LED Light-Emitting Diode

SCR — Silicon Control Rectifier

SMM — Starter Management Module

Page 306
Image 306
Carrier PC211 specifications Benshaw, Inc. Solid-State Starter Troubleshooting Guide